* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
* was re-ported from NetBSD and debianized.
*
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/*
* define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
* define DEBUG=2 to compile in and turn on debugging.
*
- * When debugging is on, debugging info will be written to ./trace and
- * a quit signal will generate a core dump.
+ * When debugging is on (DEBUG is 1 and "set -o debug" was executed),
+ * debugging info will be written to ./trace and a quit signal
+ * will generate a core dump.
*/
#define DEBUG 0
/* Tweak debug output verbosity here */
#define JOBS ENABLE_ASH_JOB_CONTROL
-#if DEBUG
-# ifndef _GNU_SOURCE
-# define _GNU_SOURCE
-# endif
-#endif
-
-#include "busybox.h" /* for applet_names */
#include <paths.h>
#include <setjmp.h>
#include <fnmatch.h>
+#include <sys/times.h>
+
+#include "busybox.h" /* for applet_names */
+#include "unicode.h"
#include "shell_common.h"
-#include "math.h"
+#if ENABLE_SH_MATH_SUPPORT
+# include "math.h"
+#endif
#if ENABLE_ASH_RANDOM_SUPPORT
# include "random.h"
#else
# define CLEAR_RANDOM_T(rnd) ((void)0)
#endif
-#define SKIP_definitions 1
-#include "applet_tables.h"
-#undef SKIP_definitions
+#include "NUM_APPLETS.h"
#if NUM_APPLETS == 1
/* STANDALONE does not make sense, and won't compile */
# undef CONFIG_FEATURE_SH_STANDALONE
# error "Do not even bother, ash will not run on NOMMU machine"
#endif
+//config:config ASH
+//config: bool "ash"
+//config: default y
+//config: depends on !NOMMU
+//config: help
+//config: Tha 'ash' shell adds about 60k in the default configuration and is
+//config: the most complete and most pedantically correct shell included with
+//config: busybox. This shell is actually a derivative of the Debian 'dash'
+//config: shell (by Herbert Xu), which was created by porting the 'ash' shell
+//config: (written by Kenneth Almquist) from NetBSD.
+//config:
+//config:config ASH_BASH_COMPAT
+//config: bool "bash-compatible extensions"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: Enable bash-compatible extensions.
+//config:
+//config:config ASH_IDLE_TIMEOUT
+//config: bool "Idle timeout variable"
+//config: default n
+//config: depends on ASH
+//config: help
+//config: Enables bash-like auto-logout after $TMOUT seconds of idle time.
+//config:
+//config:config ASH_JOB_CONTROL
+//config: bool "Job control"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: Enable job control in the ash shell.
+//config:
+//config:config ASH_ALIAS
+//config: bool "Alias support"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: Enable alias support in the ash shell.
+//config:
+//config:config ASH_GETOPTS
+//config: bool "Builtin getopt to parse positional parameters"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: Enable support for getopts builtin in ash.
+//config:
+//config:config ASH_BUILTIN_ECHO
+//config: bool "Builtin version of 'echo'"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: Enable support for echo builtin in ash.
+//config:
+//config:config ASH_BUILTIN_PRINTF
+//config: bool "Builtin version of 'printf'"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: Enable support for printf builtin in ash.
+//config:
+//config:config ASH_BUILTIN_TEST
+//config: bool "Builtin version of 'test'"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: Enable support for test builtin in ash.
+//config:
+//config:config ASH_CMDCMD
+//config: bool "'command' command to override shell builtins"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: Enable support for the ash 'command' builtin, which allows
+//config: you to run the specified command with the specified arguments,
+//config: even when there is an ash builtin command with the same name.
+//config:
+//config:config ASH_MAIL
+//config: bool "Check for new mail on interactive shells"
+//config: default n
+//config: depends on ASH
+//config: help
+//config: Enable "check for new mail" function in the ash shell.
+//config:
+//config:config ASH_OPTIMIZE_FOR_SIZE
+//config: bool "Optimize for size instead of speed"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: Compile ash for reduced size at the price of speed.
+//config:
+//config:config ASH_RANDOM_SUPPORT
+//config: bool "Pseudorandom generator and $RANDOM variable"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: Enable pseudorandom generator and dynamic variable "$RANDOM".
+//config: Each read of "$RANDOM" will generate a new pseudorandom value.
+//config: You can reset the generator by using a specified start value.
+//config: After "unset RANDOM" the generator will switch off and this
+//config: variable will no longer have special treatment.
+//config:
+//config:config ASH_EXPAND_PRMT
+//config: bool "Expand prompt string"
+//config: default y
+//config: depends on ASH
+//config: help
+//config: "PS#" may contain volatile content, such as backquote commands.
+//config: This option recreates the prompt string from the environment
+//config: variable each time it is displayed.
+//config:
+
+//applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP))
+//applet:IF_FEATURE_SH_IS_ASH(APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, sh))
+//applet:IF_FEATURE_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, bash))
+
+//kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o
+//kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o
+
/* ============ Hash table sizes. Configurable. */
/* ============ Utility functions */
#define xbarrier() do { __asm__ __volatile__ ("": : :"memory"); } while (0)
+#define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
+#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
+
static int isdigit_str9(const char *str)
{
int maxlen = 9 + 1; /* max 9 digits: 999999999 */
/* ============ Interrupts / exceptions */
+
+static void exitshell(void) NORETURN;
+
/*
* These macros allow the user to suspend the handling of interrupt signals
* over a period of time. This is similar to SIGHOLD or to sigblock, but
for (p = arg->narg.text; *p; p++) {
switch ((unsigned char)*p) {
case CTLESC:
- putc(*++p, fp);
+ p++;
+ putc(*p, fp);
break;
case CTLVAR:
putc('$', fp);
if (subtype == VSLENGTH)
putc('#', fp);
- while (*p != '=')
- putc(*p++, fp);
+ while (*p != '=') {
+ putc(*p, fp);
+ p++;
+ }
if (subtype & VSNUL)
putc(':', fp);
#endif
#if ENABLE_ASH_MAIL
static void chkmail(void);
-static void changemail(const char *) FAST_FUNC;
+static void changemail(const char *var_value) FAST_FUNC;
+#else
+# define chkmail() ((void)0)
#endif
static void changepath(const char *) FAST_FUNC;
#if ENABLE_ASH_RANDOM_SUPPORT
const char *var_text;
void (*var_func)(const char *) FAST_FUNC;
} varinit_data[] = {
+ /*
+ * Note: VEXPORT would not work correctly here for NOFORK applets:
+ * some environment strings may be constant.
+ */
{ VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
#if ENABLE_ASH_MAIL
{ VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail },
# define optindval() (voptind.var_text + 7)
#endif
-
-#define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
-#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
-
#if ENABLE_ASH_GETOPTS
static void FAST_FUNC
getoptsreset(const char *value)
#endif
/*
- * Return of a legal variable name (a letter or underscore followed by zero or
- * more letters, underscores, and digits).
- */
-static char* FAST_FUNC
-endofname(const char *name)
-{
- char *p;
-
- p = (char *) name;
- if (!is_name(*p))
- return p;
- while (*++p) {
- if (!is_in_name(*p))
- break;
- }
- return p;
-}
-
-/*
* Compares two strings up to the first = or '\0'. The first
* string must be terminated by '='; the second may be terminated by
* either '=' or '\0'.
static void
setvar(const char *name, const char *val, int flags)
{
- char *p, *q;
- size_t namelen;
+ const char *q;
+ char *p;
char *nameeq;
+ size_t namelen;
size_t vallen;
q = endofname(name);
} else {
vallen = strlen(val);
}
+
INT_OFF;
nameeq = ckmalloc(namelen + vallen + 2);
- p = (char *)memcpy(nameeq, name, namelen) + namelen;
+ p = memcpy(nameeq, name, namelen) + namelen;
if (val) {
*p++ = '=';
- p = (char *)memcpy(p, val, vallen) + vallen;
+ p = memcpy(p, val, vallen) + vallen;
}
*p = '\0';
setvareq(nameeq, flags | VNOSAVE);
free(vp);
INT_ON;
} else {
- setvar(s, 0, 0);
+ setvar2(s, 0);
vp->flags &= ~VEXPORT;
}
ok:
#endif
static void
-setprompt(int whichprompt)
+setprompt_if(smallint do_set, int whichprompt)
{
const char *prompt;
-#if ENABLE_ASH_EXPAND_PRMT
- struct stackmark smark;
-#endif
+ IF_ASH_EXPAND_PRMT(struct stackmark smark;)
+
+ if (!do_set)
+ return;
needprompt = 0;
switch (new_act) {
case S_CATCH:
act.sa_handler = signal_handler;
- act.sa_flags = 0; /* matters only if !DFL and !IGN */
- sigfillset(&act.sa_mask); /* ditto */
break;
case S_IGN:
act.sa_handler = SIG_IGN;
break;
}
+
+ /* flags and mask matter only if !DFL and !IGN, but we do it
+ * for all cases for more deterministic behavior:
+ */
+ act.sa_flags = 0;
+ sigfillset(&act.sa_mask);
+
sigaction_set(signo, &act);
*t = new_act;
/* first remove from list */
jpp = curp = &curjob;
- do {
+ while (1) {
jp1 = *jpp;
if (jp1 == jp)
break;
jpp = &jp1->prev_job;
- } while (1);
+ }
*jpp = jp1->prev_job;
/* Then re-insert in correct position */
break;
case CUR_RUNNING:
/* newly created job or backgrounded job,
- put after all stopped jobs. */
- do {
+ * put after all stopped jobs.
+ */
+ while (1) {
jp1 = *jpp;
#if JOBS
if (!jp1 || jp1->state != JOBSTOPPED)
#endif
break;
jpp = &jp1->prev_job;
- } while (1);
+ }
/* FALLTHROUGH */
#if JOBS
case CUR_STOPPED:
goto out;
/* fd is a tty at this point */
close_on_exec_on(fd);
- do { /* while we are in the background */
+ while (1) { /* while we are in the background */
pgrp = tcgetpgrp(fd);
if (pgrp < 0) {
out:
if (pgrp == getpgrp())
break;
killpg(0, SIGTTIN);
- } while (1);
+ }
initialpgrp = pgrp;
setsignal(SIGTSTP);
static int FAST_FUNC
killcmd(int argc, char **argv)
{
- int i = 1;
if (argv[1] && strcmp(argv[1], "-l") != 0) {
+ int i = 1;
do {
if (argv[i][0] == '%') {
- struct job *jp = getjob(argv[i], 0);
- unsigned pid = jp->ps[0].ps_pid;
- /* Enough space for ' -NNN<nul>' */
- argv[i] = alloca(sizeof(int)*3 + 3);
- /* kill_main has matching code to expect
- * leading space. Needed to not confuse
- * negative pids with "kill -SIGNAL_NO" syntax */
- sprintf(argv[i], " -%u", pid);
+ /*
+ * "kill %N" - job kill
+ * Converting to pgrp / pid kill
+ */
+ struct job *jp;
+ char *dst;
+ int j, n;
+
+ jp = getjob(argv[i], 0);
+ /*
+ * In jobs started under job control, we signal
+ * entire process group by kill -PGRP_ID.
+ * This happens, f.e., in interactive shell.
+ *
+ * Otherwise, we signal each child via
+ * kill PID1 PID2 PID3.
+ * Testcases:
+ * sh -c 'sleep 1|sleep 1 & kill %1'
+ * sh -c 'true|sleep 2 & sleep 1; kill %1'
+ * sh -c 'true|sleep 1 & sleep 2; kill %1'
+ */
+ n = jp->nprocs; /* can't be 0 (I hope) */
+ if (jp->jobctl)
+ n = 1;
+ dst = alloca(n * sizeof(int)*4);
+ argv[i] = dst;
+ for (j = 0; j < n; j++) {
+ struct procstat *ps = &jp->ps[j];
+ /* Skip non-running and not-stopped members
+ * (i.e. dead members) of the job
+ */
+ if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status))
+ continue;
+ /*
+ * kill_main has matching code to expect
+ * leading space. Needed to not confuse
+ * negative pids with "kill -SIGNAL_NO" syntax
+ */
+ dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid);
+ }
+ *dst = '\0';
}
} while (argv[++i]);
}
#endif
}
st &= 0x7f;
+//TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata
col = fmtstr(s, 32, strsignal(st));
if (WCOREDUMP(status)) {
col += fmtstr(s + col, 16, " (core dumped)");
break;
job = job->prev_job;
}
- } else
+ } else {
job = getjob(*argv, 0);
+ }
/* loop until process terminated or stopped */
while (job->state == JOBRUNNING)
blocking_wait_with_raise_on_sig();
INT_ON;
}
}
+ may_have_traps = 0;
}
/* Lives far away from here, needed for forkchild */
#if JOBS
/* do job control only in root shell */
doing_jobctl = 0;
- if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) {
+ if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) {
pid_t pgrp;
if (jp->nprocs == 0)
ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
}
}
- if (!oldlvl) {
+ if (oldlvl == 0) {
if (iflag) { /* why if iflag only? */
setsignal(SIGINT);
setsignal(SIGTERM);
* Code for dealing with input/output redirection.
*/
+#undef EMPTY
+#undef CLOSED
#define EMPTY -2 /* marks an unused slot in redirtab */
#define CLOSED -3 /* marks a slot of previously-closed fd */
* revealed that it was a regular file, and the file has not been
* replaced, return the file descriptor.
*/
- if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode)
- && finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
+ if (fstat(fd, &finfo2) == 0
+ && !S_ISREG(finfo2.st_mode)
+ && finfo.st_dev == finfo2.st_dev
+ && finfo.st_ino == finfo2.st_ino
+ ) {
return fd;
+ }
/* The file has been replaced. badness. */
close(fd);
char *fname;
int f;
+ fname = redir->nfile.expfname;
switch (redir->nfile.type) {
case NFROM:
- fname = redir->nfile.expfname;
f = open(fname, O_RDONLY);
if (f < 0)
goto eopen;
break;
case NFROMTO:
- fname = redir->nfile.expfname;
- f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666);
+ f = open(fname, O_RDWR|O_CREAT, 0666);
if (f < 0)
goto ecreate;
break;
#endif
/* Take care of noclobber mode. */
if (Cflag) {
- fname = redir->nfile.expfname;
f = noclobberopen(fname);
if (f < 0)
goto ecreate;
}
/* FALLTHROUGH */
case NCLOBBER:
- fname = redir->nfile.expfname;
f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666);
if (f < 0)
goto ecreate;
break;
case NAPPEND:
- fname = redir->nfile.expfname;
f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666);
if (f < 0)
goto ecreate;
static arith_t
ash_arith(const char *s)
{
- arith_eval_hooks_t math_hooks;
+ arith_state_t math_state;
arith_t result;
- int errcode = 0;
- math_hooks.lookupvar = lookupvar;
- math_hooks.setvar = setvar2;
- math_hooks.endofname = endofname;
+ math_state.lookupvar = lookupvar;
+ math_state.setvar = setvar2;
+ //math_state.endofname = endofname;
INT_OFF;
- result = arith(s, &errcode, &math_hooks);
- if (errcode < 0) {
- if (errcode == -3)
- ash_msg_and_raise_error("exponent less than 0");
- if (errcode == -2)
- ash_msg_and_raise_error("divide by zero");
- if (errcode == -5)
- ash_msg_and_raise_error("expression recursion loop detected");
- raise_error_syntax(s);
- }
+ result = arith(&math_state, s);
+ if (math_state.errmsg)
+ ash_msg_and_raise_error(math_state.errmsg);
INT_ON;
return result;
/*
* Our own itoa().
*/
+#if !ENABLE_SH_MATH_SUPPORT
+/* cvtnum() is used even if math support is off (to prepare $? values and such) */
+typedef long arith_t;
+# define ARITH_FMT "%ld"
+#endif
static int
cvtnum(arith_t num)
{
int len;
expdest = makestrspace(32, expdest);
- len = fmtstr(expdest, 32, arith_t_fmt, num);
+ len = fmtstr(expdest, 32, ARITH_FMT, num);
STADJUST(len, expdest);
return len;
}
return;
if (ifsfirst.endoff > endoff) {
- while (ifsfirst.next != NULL) {
+ while (ifsfirst.next) {
struct ifsregion *ifsp;
INT_OFF;
ifsp = ifsfirst.next->next;
ifsfirst.next = ifsp;
INT_ON;
}
- if (ifsfirst.begoff > endoff)
+ if (ifsfirst.begoff > endoff) {
ifslastp = NULL;
- else {
+ } else {
ifslastp = &ifsfirst;
ifsfirst.endoff = endoff;
}
ifslastp = &ifsfirst;
while (ifslastp->next && ifslastp->next->begoff < endoff)
- ifslastp=ifslastp->next;
- while (ifslastp->next != NULL) {
+ ifslastp = ifslastp->next;
+ while (ifslastp->next) {
struct ifsregion *ifsp;
INT_OFF;
ifsp = ifslastp->next->next;
read:
if (in.fd < 0)
break;
- i = nonblock_safe_read(in.fd, buf, sizeof(buf));
+ i = nonblock_immune_read(in.fd, buf, sizeof(buf), /*loop_on_EINTR:*/ 1);
TRACE(("expbackq: read returns %d\n", i));
if (i <= 0)
break;
if (quoted == 0)
recordregion(startloc, dest - (char *)stackblock(), 0);
- TRACE(("evalbackq: size=%d: \"%.*s\"\n",
- (dest - (char *)stackblock()) - startloc,
- (dest - (char *)stackblock()) - startloc,
+ TRACE(("evalbackq: size:%d:'%.*s'\n",
+ (int)((dest - (char *)stackblock()) - startloc),
+ (int)((dest - (char *)stackblock()) - startloc),
stackblock() + startloc));
}
p = expdest - 1;
*p = '\0';
p--;
- do {
+ while (1) {
int esc;
while ((unsigned char)*p != CTLARI) {
}
p -= esc + 1;
- } while (1);
+ }
begoff = p - start;
flags &= ~EXP_TILDE;
tilde:
q = p;
- if (*q == CTLESC && (flags & EXP_QWORD))
+ if ((unsigned char)*q == CTLESC && (flags & EXP_QWORD))
q++;
if (*q == '~')
p = exptilde(p, q, flags);
c = p[length];
if (c) {
if (!(c & 0x80)
-#if ENABLE_SH_MATH_SUPPORT
- || c == CTLENDARI
-#endif
+ IF_SH_MATH_SUPPORT(|| c == CTLENDARI)
) {
/* c == '=' || c == ':' || c == CTLENDARI */
length++;
/* "$@" syntax adherence hack */
if (!inquotes
&& memcmp(p, dolatstr, 4) == 0
- && ( p[4] == CTLQUOTEMARK
- || (p[4] == CTLENDVAR && p[5] == CTLQUOTEMARK)
+ && ( p[4] == (char)CTLQUOTEMARK
+ || (p[4] == (char)CTLENDVAR && p[5] == (char)CTLQUOTEMARK)
)
) {
p = evalvar(p + 1, flags, /* var_str_list: */ NULL) + 1;
length++;
goto addquote;
case CTLVAR:
+ TRACE(("argstr: evalvar('%s')\n", p));
p = evalvar(p, flags, var_str_list);
+ TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock()));
goto start;
case CTLBACKQ:
c = '\0';
#endif
}
}
- breakloop:
- ;
+ breakloop: ;
}
static char *
-scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM, char *str, int quotes,
- int zero)
-{
-// This commented out code was added by James Simmons <jsimmons@infradead.org>
-// as part of a larger change when he added support for ${var/a/b}.
-// However, it broke # and % operators:
-//
-//var=ababcdcd
-// ok bad
-//echo ${var#ab} abcdcd abcdcd
-//echo ${var##ab} abcdcd abcdcd
-//echo ${var#a*b} abcdcd ababcdcd (!)
-//echo ${var##a*b} cdcd cdcd
-//echo ${var#?} babcdcd ababcdcd (!)
-//echo ${var##?} babcdcd babcdcd
-//echo ${var#*} ababcdcd babcdcd (!)
-//echo ${var##*}
-//echo ${var%cd} ababcd ababcd
-//echo ${var%%cd} ababcd abab (!)
-//echo ${var%c*d} ababcd ababcd
-//echo ${var%%c*d} abab ababcdcd (!)
-//echo ${var%?} ababcdc ababcdc
-//echo ${var%%?} ababcdc ababcdcd (!)
-//echo ${var%*} ababcdcd ababcdcd
-//echo ${var%%*}
-//
-// Commenting it back out helped. Remove it completely if it really
-// is not needed.
-
- char *loc, *loc2; //, *full;
+scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM,
+ char *pattern, int quotes, int zero)
+{
+ char *loc, *loc2;
char c;
loc = startp;
loc2 = rmesc;
do {
- int match; // = strlen(str);
+ int match;
const char *s = loc2;
c = *loc2;
*loc2 = '\0';
s = rmesc;
}
- match = pmatch(str, s); // this line was deleted
-
-// // chop off end if its '*'
-// full = strrchr(str, '*');
-// if (full && full != str)
-// match--;
-//
-// // If str starts with '*' replace with s.
-// if ((*str == '*') && strlen(s) >= match) {
-// full = xstrdup(s);
-// strncpy(full+strlen(s)-match+1, str+1, match-1);
-// } else
-// full = xstrndup(str, match);
-// match = strncmp(s, full, strlen(full));
-// free(full);
-//
+ match = pmatch(pattern, s);
+
*loc2 = c;
- if (match) // if (!match)
+ if (match)
return loc;
if (quotes && (unsigned char)*loc == CTLESC)
loc++;
loc++;
loc2++;
} while (c);
- return 0;
+ return NULL;
}
static char *
-scanright(char *startp, char *rmesc, char *rmescend, char *pattern, int quotes, int match_at_start)
+scanright(char *startp, char *rmesc, char *rmescend,
+ char *pattern, int quotes, int match_at_start)
{
#if !ENABLE_ASH_OPTIMIZE_FOR_SIZE
int try2optimize = match_at_start;
}
}
}
- return 0;
+ return NULL;
}
static void varunset(const char *, const char *, const char *, int) NORETURN;
msg = umsg;
}
}
- ash_msg_and_raise_error("%.*s: %s%s", end - var - 1, var, msg, tail);
+ ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail);
}
#if ENABLE_ASH_BASH_COMPAT
static char *
-parse_sub_pattern(char *arg, int inquotes)
+parse_sub_pattern(char *arg, int varflags)
{
char *idx, *repl = NULL;
unsigned char c;
+ //char *org_arg = arg;
+ //bb_error_msg("arg:'%s' varflags:%x", arg, varflags);
idx = arg;
while (1) {
c = *arg;
}
}
*idx++ = c;
- if (!inquotes && c == '\\' && arg[1] == '\\')
- arg++; /* skip both \\, not just first one */
arg++;
+ /*
+ * Example: v='ab\c'; echo ${v/\\b/_\\_\z_}
+ * The result is a_\_z_c (not a\_\_z_c)!
+ *
+ * Enable debug prints in this function and you'll see:
+ * ash: arg:'\\b/_\\_z_' varflags:d
+ * ash: pattern:'\\b' repl:'_\_z_'
+ * That is, \\b is interpreted as \\b, but \\_ as \_!
+ * IOW: search pattern and replace string treat backslashes
+ * differently! That is the reason why we check repl below:
+ */
+ if (c == '\\' && *arg == '\\' && repl && !(varflags & VSQUOTE))
+ arg++; /* skip both '\', not just first one */
}
*idx = c; /* NUL */
+ //bb_error_msg("pattern:'%s' repl:'%s'", org_arg, repl);
return repl;
}
#endif /* ENABLE_ASH_BASH_COMPAT */
static const char *
-subevalvar(char *p, char *str, int strloc, int subtype,
+subevalvar(char *p, char *varname, int strloc, int subtype,
int startloc, int varflags, int quotes, struct strlist *var_str_list)
{
struct nodelist *saveargbackq = argbackq;
char *startp;
char *loc;
char *rmesc, *rmescend;
- IF_ASH_BASH_COMPAT(char *repl = NULL;)
- IF_ASH_BASH_COMPAT(char null = '\0';)
+ char *str;
+ IF_ASH_BASH_COMPAT(const char *repl = NULL;)
IF_ASH_BASH_COMPAT(int pos, len, orig_len;)
int saveherefd = herefd;
- int amount, workloc, resetloc;
+ int amount, resetloc;
+ IF_ASH_BASH_COMPAT(int workloc;)
int zero;
char *(*scan)(char*, char*, char*, char*, int, int);
+ //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)",
+ // p, varname, strloc, subtype, startloc, varflags, quotes);
+
herefd = -1;
argstr(p, (subtype != VSASSIGN && subtype != VSQUESTION) ? EXP_CASE : 0,
var_str_list);
switch (subtype) {
case VSASSIGN:
- setvar(str, startp, 0);
+ setvar2(varname, startp);
amount = startp - expdest;
STADJUST(amount, expdest);
return startp;
+ case VSQUESTION:
+ varunset(p, varname, startp, varflags);
+ /* NOTREACHED */
+
#if ENABLE_ASH_BASH_COMPAT
case VSSUBSTR:
loc = str = stackblock() + strloc;
STADJUST(amount, expdest);
return loc;
#endif
-
- case VSQUESTION:
- varunset(p, str, startp, varflags);
- /* NOTREACHED */
}
+
resetloc = expdest - (char *)stackblock();
/* We'll comeback here if we grow the stack while handling
rmescend--;
str = (char *)stackblock() + strloc;
preglob(str, varflags & VSQUOTE, 0);
- workloc = expdest - (char *)stackblock();
#if ENABLE_ASH_BASH_COMPAT
+ workloc = expdest - (char *)stackblock();
if (subtype == VSREPLACE || subtype == VSREPLACEALL) {
char *idx, *end;
if (!repl) {
- repl = parse_sub_pattern(str, varflags & VSQUOTE);
+ repl = parse_sub_pattern(str, varflags);
+ //bb_error_msg("repl:'%s'", repl);
if (!repl)
- repl = &null;
+ repl = nullstr;
}
/* If there's no pattern to match, return the expansion unmolested */
if (str[0] == '\0')
- return 0;
+ return NULL;
len = 0;
idx = startp;
while (idx < end) {
try_to_match:
loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
+ //bb_error_msg("scanright('%s'):'%s'", str, loc);
if (!loc) {
/* No match, advance */
char *restart_detect = stackblock();
idx = loc;
}
- for (loc = repl; *loc; loc++) {
+ //bb_error_msg("repl:'%s'", repl);
+ for (loc = (char*)repl; *loc; loc++) {
char *restart_detect = stackblock();
+ if (quotes && *loc == '\\') {
+ STPUTC(CTLESC, expdest);
+ len++;
+ }
STPUTC(*loc, expdest);
if (stackblock() != restart_detect)
goto restart;
}
if (subtype == VSREPLACE) {
+ //bb_error_msg("tail:'%s', quotes:%x", idx, quotes);
while (*idx) {
char *restart_detect = stackblock();
STPUTC(*idx, expdest);
/* We've put the replaced text into a buffer at workloc, now
* move it to the right place and adjust the stack.
*/
- startp = stackblock() + startloc;
STPUTC('\0', expdest);
- memmove(startp, stackblock() + workloc, len);
- startp[len++] = '\0';
- amount = expdest - ((char *)stackblock() + startloc + len - 1);
+ startp = (char *)stackblock() + startloc;
+ memmove(startp, (char *)stackblock() + workloc, len + 1);
+ //bb_error_msg("startp:'%s'", startp);
+ amount = expdest - (startp + len);
STADJUST(-amount, expdest);
return startp;
}
vsplus:
if (varlen < 0) {
argstr(
- p, flags | EXP_TILDE |
- (quoted ? EXP_QWORD : EXP_WORD),
+ p,
+ flags | (quoted ? EXP_TILDE|EXP_QWORD : EXP_TILDE|EXP_WORD),
var_str_list
);
goto end;
*/
STPUTC('\0', expdest);
patloc = expdest - (char *)stackblock();
- if (0 == subevalvar(p, /* str: */ NULL, patloc, subtype,
+ if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype,
startloc, varflags,
-//TODO: | EXP_REDIR too? All other such places do it too
- /* quotes: */ flags & (EXP_FULL | EXP_CASE),
+ /* quotes: */ flags & (EXP_FULL | EXP_CASE | EXP_REDIR),
var_str_list)
) {
int amount = expdest - (
exparg.lastp = &sp->next;
}
-static char *expdir;
-
/*
* Do metacharacter (i.e. *, ?, [...]) expansion.
*/
static void
-expmeta(char *enddir, char *name)
+expmeta(char *expdir, char *enddir, char *name)
{
char *p;
const char *cp;
for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
continue;
p[-1] = '/';
- expmeta(p, endname);
+ expmeta(expdir, p, endname);
}
}
}
/* TODO - EXP_REDIR */
while (str) {
+ char *expdir;
struct strlist **savelastp;
struct strlist *sp;
char *p;
int i = strlen(str->text);
expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
}
-
- expmeta(expdir, p);
+ expmeta(expdir, expdir, p);
free(expdir);
if (p != str->text)
free(p);
STARTSTACKSTR(expdest);
ifsfirst.next = NULL;
ifslastp = NULL;
+ TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag));
argstr(arg->narg.text, flag,
/* var_str_list: */ arglist ? arglist->list : NULL);
p = _STPUTC('\0', expdest);
return; /* here document expanded */
}
p = grabstackstr(p);
+ TRACE(("expandarg: p:'%s'\n", p));
exparg.lastp = &exparg.list;
/*
* TODO - EXP_REDIR
exparg.lastp = &exparg.list;
expandmeta(exparg.list /*, flag*/);
} else {
- if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
+ if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */
rmescapes(p, 0);
+ TRACE(("expandarg: rmescapes:'%s'\n", p));
+ }
sp = stzalloc(sizeof(*sp));
sp->text = p;
*exparg.lastp = sp;
static void
tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp)
{
- int repeated = 0;
-
#if ENABLE_FEATURE_SH_STANDALONE
if (applet_no >= 0) {
if (APPLET_IS_NOEXEC(applet_no)) {
+ clearenv();
while (*envp)
putenv(*envp++);
run_applet_no_and_exit(applet_no, argv);
#else
execve(cmd, argv, envp);
#endif
- if (repeated) {
+ if (cmd == (char*) bb_busybox_exec_path) {
+ /* We already visited ENOEXEC branch below, don't do it again */
+//TODO: try execve(initial_argv0_of_shell, argv, envp) before giving up?
free(argv);
return;
}
if (errno == ENOEXEC) {
+ /* Run "cmd" as a shell script:
+ * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html
+ * "If the execve() function fails with ENOEXEC, the shell
+ * shall execute a command equivalent to having a shell invoked
+ * with the command name as its first operand,
+ * with any remaining arguments passed to the new shell"
+ *
+ * That is, do not use $SHELL, user's shell, or /bin/sh;
+ * just call ourselves.
+ *
+ * Note that bash reads ~80 chars of the file, and if it sees
+ * a zero byte before it sees newline, it doesn't try to
+ * interpret it, but fails with "cannot execute binary file"
+ * message and exit code 126. For one, this prevents attempts
+ * to interpret foreign ELF binaries as shell scripts.
+ */
char **ap;
char **new;
for (ap = argv; *ap; ap++)
continue;
- ap = new = ckmalloc((ap - argv + 2) * sizeof(ap[0]));
- ap[1] = cmd;
- ap[0] = cmd = (char *)DEFAULT_SHELL;
- ap += 2;
- argv++;
- while ((*ap++ = *argv++) != NULL)
+ new = ckmalloc((ap - argv + 2) * sizeof(new[0]));
+ new[0] = (char*) "ash";
+ new[1] = cmd;
+ ap = new + 2;
+ while ((*ap++ = *++argv) != NULL)
continue;
+ cmd = (char*) bb_busybox_exec_path;
argv = new;
- repeated++;
goto repeat;
}
}
int e;
char **envp;
int exerrno;
-#if ENABLE_FEATURE_SH_STANDALONE
- int applet_no = -1;
-#endif
+ int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
clearredir(/*drop:*/ 1);
- envp = listvars(VEXPORT, VUNSET, 0);
+ envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
if (strchr(argv[0], '/') != NULL
#if ENABLE_FEATURE_SH_STANDALONE
|| (applet_no = find_applet_by_name(argv[0])) >= 0
#endif
) {
tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
+ if (applet_no >= 0) {
+ /* We tried execing ourself, but it didn't work.
+ * Maybe /proc/self/exe doesn't exist?
+ * Try $PATH search.
+ */
+ goto try_PATH;
+ }
e = errno;
} else {
+ try_PATH:
e = ENOENT;
while ((cmdname = path_advance(&path, argv[0])) != NULL) {
if (--idx < 0 && pathopt == NULL) {
for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
if (cmdp->cmdtype == CMDNORMAL
|| (cmdp->cmdtype == CMDBUILTIN
- && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
+ && !IS_BUILTIN_REGULAR(cmdp->param.cmd)
&& builtinloc > 0)
) {
cmdp->rehash = 1;
/* Called to execute a trap.
* Single callsite - at the end of evaltree().
- * If we return non-zero, exaltree raises EXEXIT exception.
+ * If we return non-zero, evaltree raises EXEXIT exception.
*
* Perhaps we should avoid entering new trap handlers
* while we are executing a trap handler. [is it a TODO?]
out:
exception_handler = savehandler;
+
out1:
+ /* Order of checks below is important:
+ * signal handlers trigger before exit caused by "set -e".
+ */
+ if (pending_sig && dotrap())
+ goto exexit;
if (checkexit & exitstatus)
evalskip |= SKIPEVAL;
- else if (pending_sig && dotrap())
- goto exexit;
if (flags & EV_EXIT) {
exexit:
loopnest++;
flags &= EV_TESTED;
for (sp = arglist.list; sp; sp = sp->next) {
- setvar(n->nfor.var, sp->text, 0);
+ setvar2(n->nfor.var, sp->text);
evaltree(n->nfor.body, flags);
if (evalskip) {
if (evalskip == SKIPCONT && --skipcount <= 0) {
case NCLOBBER:
case NAPPEND:
expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
+ TRACE(("expredir expanded to '%s'\n", fn.list->text));
#if ENABLE_ASH_BASH_COMPAT
store_expfname:
#endif
+#if 0
+// By the design of stack allocator, the loop of this kind:
+// while true; do while true; do break; done </dev/null; done
+// will look like a memory leak: ash plans to free expfname's
+// of "/dev/null" as soon as it finishes running the loop
+// (in this case, never).
+// This "fix" is wrong:
+ if (redir->nfile.expfname)
+ stunalloc(redir->nfile.expfname);
+// It results in corrupted state of stacked allocations.
+#endif
redir->nfile.expfname = fn.list->text;
break;
case NFROMFD:
while ((lvp = localvars) != NULL) {
localvars = lvp->next;
vp = lvp->vp;
- TRACE(("poplocalvar %s\n", vp ? vp->text : "-"));
+ TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-"));
if (vp == NULL) { /* $- saved */
memcpy(optlist, lvp->text, sizeof(optlist));
free((char*)lvp->text);
#if !ENABLE_FEATURE_SH_EXTRA_QUIET
static int helpcmd(int, char **) FAST_FUNC;
#endif
+#if MAX_HISTORY
+static int historycmd(int, char **) FAST_FUNC;
+#endif
#if ENABLE_SH_MATH_SUPPORT
static int letcmd(int, char **) FAST_FUNC;
#endif
#if !ENABLE_FEATURE_SH_EXTRA_QUIET
{ BUILTIN_NOSPEC "help" , helpcmd },
#endif
+#if MAX_HISTORY
+ { BUILTIN_NOSPEC "history" , historycmd },
+#endif
#if JOBS
{ BUILTIN_REGULAR "jobs" , jobscmd },
{ BUILTIN_REGULAR "kill" , killcmd },
/* Print the command if xflag is set. */
if (xflag) {
int n;
- const char *p = " %s";
+ const char *p = " %s" + 1;
- p++;
fdprintf(preverrout_fd, p, expandstr(ps4val()));
-
sp = varlist.list;
for (n = 0; n < 2; n++) {
while (sp) {
fdprintf(preverrout_fd, p, sp->text);
sp = sp->next;
- if (*p == '%') {
- p--;
- }
+ p = " %s";
}
sp = arglist.list;
}
/* Now locate the command. */
if (argc) {
- const char *oldpath;
int cmd_flag = DO_ERR;
-
+#if ENABLE_ASH_CMDCMD
+ const char *oldpath = path + 5;
+#endif
path += 5;
- oldpath = path;
for (;;) {
find_command(argv[0], &cmdentry, cmd_flag, path);
if (cmdentry.cmdtype == CMDUNKNOWN) {
* '_' in 'vi' command mode during line editing...
* However I implemented that within libedit itself.
*/
- setvar("_", lastarg, 0);
+ setvar2("_", lastarg);
}
popstackmark(&smark);
}
static int
goodname(const char *p)
{
- return !*endofname(p);
+ return endofname(p)[0] == '\0';
}
#if ENABLE_FEATURE_EDITING
retry:
if (!iflag || g_parsefile->pf_fd != STDIN_FILENO)
- nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
+ nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1, /*loop_on_EINTR:*/ 1);
else {
-#if ENABLE_FEATURE_TAB_COMPLETION
+ int timeout = -1;
+# if ENABLE_ASH_IDLE_TIMEOUT
+ if (iflag) {
+ const char *tmout_var = lookupvar("TMOUT");
+ if (tmout_var) {
+ timeout = atoi(tmout_var) * 1000;
+ if (timeout <= 0)
+ timeout = -1;
+ }
+ }
+# endif
+# if ENABLE_FEATURE_TAB_COMPLETION
line_input_state->path_lookup = pathval();
-#endif
- nr = read_line_input(cmdedit_prompt, buf, IBUFSIZ, line_input_state);
+# endif
+ /* Unicode support should be activated even if LANG is set
+ * _during_ shell execution, not only if it was set when
+ * shell was started. Therefore, re-check LANG every time:
+ */
+ {
+ const char *s = lookupvar("LC_ALL");
+ if (!s) s = lookupvar("LC_CTYPE");
+ if (!s) s = lookupvar("LANG");
+ reinit_unicode(s);
+ }
+ nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout);
if (nr == 0) {
/* Ctrl+C pressed */
if (trap[SIGINT]) {
}
goto retry;
}
- if (nr < 0 && errno == 0) {
- /* Ctrl+D pressed */
- nr = 0;
+ if (nr < 0) {
+ if (errno == 0) {
+ /* Ctrl+D pressed */
+ nr = 0;
+ }
+# if ENABLE_ASH_IDLE_TIMEOUT
+ else if (errno == EAGAIN && timeout > 0) {
+ printf("\007timed out waiting for input: auto-logout\n");
+ exitshell();
+ }
+# endif
}
}
#else
- nr = nonblock_safe_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1);
+ nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1, /*loop_on_EINTR:*/ 1);
#endif
-#if 0
-/* nonblock_safe_read() handles this problem */
+#if 0 /* disabled: nonblock_immune_read() handles this problem */
if (nr < 0) {
if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
int flags = fcntl(0, F_GETFL);
else if (*argptr == NULL)
setparam(argptr);
}
- break; /* "-" or "--" terminates options */
+ break; /* "-" or "--" terminates options */
}
}
/* first char was + or - */
if (!argv[1])
return showvars(nullstr, 0, VUNSET);
+
INT_OFF;
- retval = 1;
- if (!options(0)) { /* if no parse error... */
- retval = 0;
+ retval = options(/*cmdline:*/ 0);
+ if (retval == 0) { /* if no parse error... */
optschanged();
if (*argptr != NULL) {
setparam(argptr);
startlinno = g_parsefile->linno;
bqlist = NULL;
quotef = 0;
- oldstyle = 0;
prevsyntax = 0;
#if ENABLE_ASH_EXPAND_PRMT
pssyntax = (syntax == PSSYNTAX);
STARTSTACKSTR(out);
loop:
/* For each line, until end of word */
- {
- CHECKEND(); /* set c to PEOF if at end of here document */
- for (;;) { /* until end of line or end of word */
- CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
- switch (SIT(c, syntax)) {
- case CNL: /* '\n' */
- if (syntax == BASESYNTAX)
- goto endword; /* exit outer loop */
- USTPUTC(c, out);
- g_parsefile->linno++;
- if (doprompt)
- setprompt(2);
- c = pgetc();
- goto loop; /* continue outer loop */
- case CWORD:
- USTPUTC(c, out);
- break;
- case CCTL:
- if (eofmark == NULL || dblquote)
- USTPUTC(CTLESC, out);
+ CHECKEND(); /* set c to PEOF if at end of here document */
+ for (;;) { /* until end of line or end of word */
+ CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
+ switch (SIT(c, syntax)) {
+ case CNL: /* '\n' */
+ if (syntax == BASESYNTAX)
+ goto endword; /* exit outer loop */
+ USTPUTC(c, out);
+ g_parsefile->linno++;
+ setprompt_if(doprompt, 2);
+ c = pgetc();
+ goto loop; /* continue outer loop */
+ case CWORD:
+ USTPUTC(c, out);
+ break;
+ case CCTL:
+ if (eofmark == NULL || dblquote)
+ USTPUTC(CTLESC, out);
#if ENABLE_ASH_BASH_COMPAT
- if (c == '\\' && bash_dollar_squote) {
- c = decode_dollar_squote();
- if (c & 0x100) {
- USTPUTC('\\', out);
- c = (unsigned char)c;
- }
+ if (c == '\\' && bash_dollar_squote) {
+ c = decode_dollar_squote();
+ if (c & 0x100) {
+ USTPUTC('\\', out);
+ c = (unsigned char)c;
}
+ }
#endif
- USTPUTC(c, out);
- break;
- case CBACK: /* backslash */
- c = pgetc_without_PEOA();
- if (c == PEOF) {
+ USTPUTC(c, out);
+ break;
+ case CBACK: /* backslash */
+ c = pgetc_without_PEOA();
+ if (c == PEOF) {
+ USTPUTC(CTLESC, out);
+ USTPUTC('\\', out);
+ pungetc();
+ } else if (c == '\n') {
+ setprompt_if(doprompt, 2);
+ } else {
+#if ENABLE_ASH_EXPAND_PRMT
+ if (c == '$' && pssyntax) {
USTPUTC(CTLESC, out);
USTPUTC('\\', out);
- pungetc();
- } else if (c == '\n') {
- if (doprompt)
- setprompt(2);
- } else {
-#if ENABLE_ASH_EXPAND_PRMT
- if (c == '$' && pssyntax) {
- USTPUTC(CTLESC, out);
- USTPUTC('\\', out);
- }
+ }
#endif
- if (dblquote && c != '\\'
- && c != '`' && c != '$'
- && (c != '"' || eofmark != NULL)
- ) {
- USTPUTC(CTLESC, out);
- USTPUTC('\\', out);
- }
- if (SIT(c, SQSYNTAX) == CCTL)
- USTPUTC(CTLESC, out);
- USTPUTC(c, out);
- quotef = 1;
+ /* Backslash is retained if we are in "str" and next char isn't special */
+ if (dblquote
+ && c != '\\'
+ && c != '`'
+ && c != '$'
+ && (c != '"' || eofmark != NULL)
+ ) {
+ USTPUTC(CTLESC, out);
+ USTPUTC('\\', out);
}
- break;
- case CSQUOTE:
- syntax = SQSYNTAX;
+ if (SIT(c, SQSYNTAX) == CCTL)
+ USTPUTC(CTLESC, out);
+ USTPUTC(c, out);
+ quotef = 1;
+ }
+ break;
+ case CSQUOTE:
+ syntax = SQSYNTAX;
quotemark:
- if (eofmark == NULL) {
- USTPUTC(CTLQUOTEMARK, out);
+ if (eofmark == NULL) {
+ USTPUTC(CTLQUOTEMARK, out);
+ }
+ break;
+ case CDQUOTE:
+ syntax = DQSYNTAX;
+ dblquote = 1;
+ goto quotemark;
+ case CENDQUOTE:
+ IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
+ if (eofmark != NULL && arinest == 0
+ && varnest == 0
+ ) {
+ USTPUTC(c, out);
+ } else {
+ if (dqvarnest == 0) {
+ syntax = BASESYNTAX;
+ dblquote = 0;
}
- break;
- case CDQUOTE:
- syntax = DQSYNTAX;
- dblquote = 1;
+ quotef = 1;
goto quotemark;
- case CENDQUOTE:
- IF_ASH_BASH_COMPAT(bash_dollar_squote = 0;)
- if (eofmark != NULL && arinest == 0
- && varnest == 0
- ) {
- USTPUTC(c, out);
- } else {
- if (dqvarnest == 0) {
- syntax = BASESYNTAX;
- dblquote = 0;
- }
- quotef = 1;
- goto quotemark;
- }
- break;
- case CVAR: /* '$' */
- PARSESUB(); /* parse substitution */
- break;
- case CENDVAR: /* '}' */
- if (varnest > 0) {
- varnest--;
- if (dqvarnest > 0) {
- dqvarnest--;
- }
- USTPUTC(CTLENDVAR, out);
- } else {
- USTPUTC(c, out);
+ }
+ break;
+ case CVAR: /* '$' */
+ PARSESUB(); /* parse substitution */
+ break;
+ case CENDVAR: /* '}' */
+ if (varnest > 0) {
+ varnest--;
+ if (dqvarnest > 0) {
+ dqvarnest--;
}
- break;
+ c = CTLENDVAR;
+ }
+ USTPUTC(c, out);
+ break;
#if ENABLE_SH_MATH_SUPPORT
- case CLP: /* '(' in arithmetic */
- parenlevel++;
- USTPUTC(c, out);
- break;
- case CRP: /* ')' in arithmetic */
- if (parenlevel > 0) {
- USTPUTC(c, out);
- --parenlevel;
- } else {
- if (pgetc() == ')') {
- if (--arinest == 0) {
- USTPUTC(CTLENDARI, out);
- syntax = prevsyntax;
- dblquote = (syntax == DQSYNTAX);
- } else
- USTPUTC(')', out);
- } else {
- /*
- * unbalanced parens
- * (don't 2nd guess - no error)
- */
- pungetc();
- USTPUTC(')', out);
+ case CLP: /* '(' in arithmetic */
+ parenlevel++;
+ USTPUTC(c, out);
+ break;
+ case CRP: /* ')' in arithmetic */
+ if (parenlevel > 0) {
+ parenlevel--;
+ } else {
+ if (pgetc() == ')') {
+ if (--arinest == 0) {
+ syntax = prevsyntax;
+ dblquote = (syntax == DQSYNTAX);
+ c = CTLENDARI;
}
+ } else {
+ /*
+ * unbalanced parens
+ * (don't 2nd guess - no error)
+ */
+ pungetc();
}
- break;
+ }
+ USTPUTC(c, out);
+ break;
#endif
- case CBQUOTE: /* '`' */
- PARSEBACKQOLD();
- break;
- case CENDFILE:
- goto endword; /* exit outer loop */
- case CIGN:
- break;
- default:
- if (varnest == 0) {
+ case CBQUOTE: /* '`' */
+ PARSEBACKQOLD();
+ break;
+ case CENDFILE:
+ goto endword; /* exit outer loop */
+ case CIGN:
+ break;
+ default:
+ if (varnest == 0) {
#if ENABLE_ASH_BASH_COMPAT
- if (c == '&') {
- if (pgetc() == '>')
- c = 0x100 + '>'; /* flag &> */
- pungetc();
- }
-#endif
- goto endword; /* exit outer loop */
+ if (c == '&') {
+ if (pgetc() == '>')
+ c = 0x100 + '>'; /* flag &> */
+ pungetc();
}
- IF_ASH_ALIAS(if (c != PEOA))
- USTPUTC(c, out);
-
+#endif
+ goto endword; /* exit outer loop */
}
- c = pgetc_fast();
- } /* for (;;) */
- }
+ IF_ASH_ALIAS(if (c != PEOA))
+ USTPUTC(c, out);
+ }
+ c = pgetc_fast();
+ } /* for (;;) */
endword:
+
#if ENABLE_SH_MATH_SUPPORT
if (syntax == ARISYNTAX)
raise_error_syntax("missing '))'");
unsigned char subtype;
int typeloc;
int flags;
- char *p;
- static const char types[] ALIGN1 = "}-+?=";
c = pgetc();
if (c > 255 /* PEOA or PEOF */
#endif
USTPUTC('$', out);
pungetc();
- } else if (c == '(') { /* $(command) or $((arith)) */
+ } else if (c == '(') {
+ /* $(command) or $((arith)) */
if (pgetc() == '(') {
#if ENABLE_SH_MATH_SUPPORT
PARSEARITH();
PARSEBACKQNEW();
}
} else {
+ /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */
USTPUTC(CTLVAR, out);
typeloc = out - (char *)stackblock();
USTPUTC(VSNORMAL, out);
if (c == '#') {
c = pgetc();
if (c == '}')
- c = '#';
+ c = '#'; /* ${#} - same as $# */
else
- subtype = VSLENGTH;
- } else
+ subtype = VSLENGTH; /* ${#VAR} */
+ } else {
subtype = 0;
+ }
}
if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) {
+ /* $[{[#]]NAME[}] */
do {
STPUTC(c, out);
c = pgetc();
} while (c <= 255 /* not PEOA or PEOF */ && is_in_name(c));
} else if (isdigit(c)) {
+ /* $[{[#]]NUM[}] */
do {
STPUTC(c, out);
c = pgetc();
} while (isdigit(c));
} else if (is_special(c)) {
+ /* $[{[#]]<specialchar>[}] */
USTPUTC(c, out);
c = pgetc();
} else {
badsub:
raise_error_syntax("bad substitution");
}
- if (c != '}' && subtype == VSLENGTH)
+ if (c != '}' && subtype == VSLENGTH) {
+ /* ${#VAR didn't end with } */
goto badsub;
+ }
STPUTC('=', out);
flags = 0;
if (subtype == 0) {
+ /* ${VAR...} but not $VAR or ${#VAR} */
+ /* c == first char after VAR */
switch (c) {
case ':':
c = pgetc();
#if ENABLE_ASH_BASH_COMPAT
if (c == ':' || c == '$' || isdigit(c)) {
- pungetc();
+//TODO: support more general format ${v:EXPR:EXPR},
+// where EXPR follows $(()) rules
subtype = VSSUBSTR;
- break;
+ pungetc();
+ break; /* "goto do_pungetc" is bigger (!) */
}
#endif
flags = VSNUL;
/*FALLTHROUGH*/
- default:
- p = strchr(types, c);
+ default: {
+ static const char types[] ALIGN1 = "}-+?=";
+ const char *p = strchr(types, c);
if (p == NULL)
goto badsub;
subtype = p - types + VSNORMAL;
break;
+ }
case '%':
case '#': {
int cc = c;
- subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT;
+ subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT);
c = pgetc();
- if (c == cc)
- subtype++;
- else
- pungetc();
+ if (c != cc)
+ goto do_pungetc;
+ subtype++;
break;
}
#if ENABLE_ASH_BASH_COMPAT
case '/':
+ /* ${v/[/]pattern/repl} */
+//TODO: encode pattern and repl separately.
+// Currently ${v/$var_with_slash/repl} is horribly broken
subtype = VSREPLACE;
c = pgetc();
- if (c == '/')
- subtype++; /* VSREPLACEALL */
- else
- pungetc();
+ if (c != '/')
+ goto do_pungetc;
+ subtype++; /* VSREPLACEALL */
break;
#endif
}
} else {
+ do_pungetc:
pungetc();
}
if (dblquote || arinest)
INT_ON;
if (oldstyle) {
/* We must read until the closing backquote, giving special
- treatment to some slashes, and then push the string and
- reread it as input, interpreting it normally. */
+ * treatment to some slashes, and then push the string and
+ * reread it as input, interpreting it normally.
+ */
char *pout;
- int pc;
size_t psavelen;
char *pstr;
-
STARTSTACKSTR(pout);
for (;;) {
- if (needprompt) {
- setprompt(2);
- }
+ int pc;
+
+ setprompt_if(needprompt, 2);
pc = pgetc();
switch (pc) {
case '`':
pc = pgetc();
if (pc == '\n') {
g_parsefile->linno++;
- if (doprompt)
- setprompt(2);
+ setprompt_if(doprompt, 2);
/*
* If eating a newline, avoid putting
* the newline into the new character
tokpushback = 0;
return lasttoken;
}
- if (needprompt) {
- setprompt(2);
- }
+ setprompt_if(needprompt, 2);
startlinno = g_parsefile->linno;
for (;;) { /* until token or start of word found */
c = pgetc_fast();
break; /* return readtoken1(...) */
}
startlinno = ++g_parsefile->linno;
- if (doprompt)
- setprompt(2);
+ setprompt_if(doprompt, 2);
} else {
const char *p;
tokpushback = 0;
return lasttoken;
}
- if (needprompt) {
- setprompt(2);
- }
+ setprompt_if(needprompt, 2);
startlinno = g_parsefile->linno;
for (;;) { /* until token or start of word found */
c = pgetc_fast();
case '\\':
if (pgetc() == '\n') {
startlinno = ++g_parsefile->linno;
- if (doprompt)
- setprompt(2);
+ setprompt_if(doprompt, 2);
continue;
}
pungetc();
tokpushback = 0;
doprompt = interact;
- if (doprompt)
- setprompt(doprompt);
+ setprompt_if(doprompt, doprompt);
needprompt = 0;
t = readtoken();
if (t == TEOF)
heredoclist = NULL;
while (here) {
- if (needprompt) {
- setprompt(2);
- }
- readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
+ setprompt_if(needprompt, 2);
+ readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
here->eofmark, here->striptabs);
n = stzalloc(sizeof(struct narg));
n->narg.type = NARG;
p = grabstackstr(concat);
}
evalstring(p, ~SKIPEVAL);
-
}
return exitstatus;
}
inter = 0;
if (iflag && top) {
inter++;
-#if ENABLE_ASH_MAIL
chkmail();
-#endif
}
n = parsecmd(inter);
#if DEBUG
/* "false; . empty_file; echo $?" should print 0, not 1: */
exitstatus = 0;
+ /* This aborts if file isn't found, which is POSIXly correct.
+ * bash returns exitcode 1 instead.
+ */
fullname = find_dot_file(argv[1]);
-
argv += 2;
argc -= 2;
if (argc) { /* argc > 0, argv[0] != NULL */
shellparam.p = argv;
};
+ /* This aborts if file can't be opened, which is POSIXly correct.
+ * bash returns exitcode 1 instead.
+ */
setinputfile(fullname, INPUT_PUSH_FILE);
commandname = fullname;
cmdloop(0);
}
if ((act & DO_NOFUNC)
|| !prefix(pathopt, "func")
- ) { /* ignore unimplemented options */
+ ) { /* ignore unimplemented options */
continue;
}
}
}
#endif /* FEATURE_SH_EXTRA_QUIET */
+#if MAX_HISTORY
+static int FAST_FUNC
+historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
+{
+ show_history(line_input_state);
+ return EXIT_SUCCESS;
+}
+#endif
+
/*
* The export and readonly commands.
*/
char *name;
const char *p;
char **aptr;
- int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
+ char opt;
+ int flag;
+ int flag_off;
- if (nextopt("p") != 'p') {
+ /* "readonly" in bash accepts, but ignores -n.
+ * We do the same: it saves a conditional in nextopt's param.
+ */
+ flag_off = 0;
+ while ((opt = nextopt("np")) != '\0') {
+ if (opt == 'n')
+ flag_off = VEXPORT;
+ }
+ flag = VEXPORT;
+ if (argv[0][0] == 'r') {
+ flag = VREADONLY;
+ flag_off = 0; /* readonly ignores -n */
+ }
+ flag_off = ~flag_off;
+
+ /*if (opt_p_not_specified) - bash doesnt check this. Try "export -p NAME" */
+ {
aptr = argptr;
name = *aptr;
if (name) {
} else {
vp = *findvar(hashvar(name), name);
if (vp) {
- vp->flags |= flag;
+ vp->flags = ((vp->flags | flag) & flag_off);
continue;
}
}
- setvar(name, p, flag);
+ setvar(name, p, (flag & flag_off));
} while ((name = *++aptr) != NULL);
return 0;
}
}
+
+ /* No arguments. Show the list of exported or readonly vars.
+ * -n is ignored.
+ */
showvars(argv[0], flag, 0);
return 0;
}
struct tblentry *cmdp;
cmdp = cmdlookup(name, 0);
- if (cmdp!= NULL && cmdp->cmdtype == CMDFUNCTION)
+ if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION)
delete_cmd_entry();
}
int flag = 0;
int ret = 0;
- while ((i = nextopt("vf")) != '\0') {
+ while ((i = nextopt("vf")) != 0) {
flag = i;
}
return ret & 1;
}
-
-/* setmode.c */
-
-#include <sys/times.h>
-
static const unsigned char timescmd_str[] ALIGN1 = {
' ', offsetof(struct tms, tms_utime),
'\n', offsetof(struct tms, tms_stime),
'\n', offsetof(struct tms, tms_cstime),
0
};
-
static int FAST_FUNC
timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
- long clk_tck, s, t;
+ unsigned long clk_tck, s, t;
const unsigned char *p;
struct tms buf;
do {
t = *(clock_t *)(((char *) &buf) + p[1]);
s = t / clk_tck;
- out1fmt("%ldm%ld.%.3lds%c",
- s/60, s%60,
- ((t - s * clk_tck) * 1000) / clk_tck,
+ t = t % clk_tck;
+ out1fmt("%lum%lu.%03lus%c",
+ s / 60, s % 60,
+ (t * 1000) / clk_tck,
p[0]);
- } while (*(p += 2));
+ p += 2;
+ } while (*p);
return 0;
}
#if ENABLE_SH_MATH_SUPPORT
/*
- * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
+ * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell.
* Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
*
* Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
return !i;
}
-#endif /* SH_MATH_SUPPORT */
-
-
-/* ============ miscbltin.c
- *
- * Miscellaneous builtins.
- */
-
-#undef rflag
-
-#if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
-typedef enum __rlimit_resource rlim_t;
#endif
/*
}
}
+ /* "read -s" needs to save/restore termios, can't allow ^C
+ * to jump out of it.
+ */
+ INT_OFF;
r = shell_builtin_read(setvar2,
argptr,
bltinlookup("IFS"), /* can be NULL */
opt_t,
opt_u
);
+ INT_ON;
if ((uintptr_t)r > 1)
ash_msg_and_raise_error(r);
/*
* Called to exit the shell.
*/
-static void exitshell(void) NORETURN;
static void
exitshell(void)
{
char *p;
int status;
+#if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT
+ save_history(line_input_state);
+#endif
+
status = exitstatus;
TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
if (setjmp(loc.loc)) {
/* bash re-enables SIGHUP which is SIG_IGNed on entry.
* Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$"
*/
- signal(SIGHUP, SIG_DFL);
+ signal(SIGHUP, SIG_DFL);
/* from var.c: */
{
}
}
- setvar("PPID", utoa(getppid()), 0);
-
+ setvar2("PPID", utoa(getppid()));
+#if ENABLE_ASH_BASH_COMPAT
+ p = lookupvar("SHLVL");
+ setvar2("SHLVL", utoa(p ? atoi(p) + 1 : 1));
+#endif
p = lookupvar("PWD");
- if (p)
+ if (p) {
if (*p != '/' || stat(p, &st1) || stat(".", &st2)
- || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
+ || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino
+ ) {
p = '\0';
+ }
+ }
setpwd(p, 0);
}
}
+
+//usage:#define ash_trivial_usage
+//usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]"
+//usage:#define ash_full_usage "\n\n"
+//usage: "Unix shell interpreter"
+
+//usage:#if ENABLE_FEATURE_SH_IS_ASH
+//usage:# define sh_trivial_usage ash_trivial_usage
+//usage:# define sh_full_usage ash_full_usage
+//usage:#endif
+//usage:#if ENABLE_FEATURE_BASH_IS_ASH
+//usage:# define bash_trivial_usage ash_trivial_usage
+//usage:# define bash_full_usage ash_full_usage
+//usage:#endif
+
/*
* Process the shell command line arguments.
*/
for (i = 0; i < NOPTS; i++)
optlist[i] = 2;
argptr = xargv;
- if (options(1)) {
+ if (options(/*cmdline:*/ 1)) {
/* it already printed err message */
raise_exception(EXERROR);
}
if (e == EXERROR)
exitstatus = 2;
s = state;
- if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
+ if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) {
exitshell();
- if (e == EXINT)
+ }
+ if (e == EXINT) {
outcslow('\n', stderr);
+ }
popstackmark(&smark);
FORCE_INT_ON; /* enable interrupts */
setstackmark(&smark);
procargs(argv);
-#if ENABLE_FEATURE_EDITING_SAVEHISTORY
- if (iflag) {
- const char *hp = lookupvar("HISTFILE");
-
- if (hp == NULL) {
- hp = lookupvar("HOME");
- if (hp != NULL) {
- char *defhp = concat_path_file(hp, ".ash_history");
- setvar("HISTFILE", defhp, 0);
- free(defhp);
- }
- }
- }
-#endif
- if (/* argv[0] && */ argv[0][0] == '-')
+ if (argv[0] && argv[0][0] == '-')
isloginsh = 1;
if (isloginsh) {
+ const char *hp;
+
state = 1;
read_profile("/etc/profile");
state1:
state = 2;
- read_profile(".profile");
+ hp = lookupvar("HOME");
+ if (hp) {
+ hp = concat_path_file(hp, ".profile");
+ read_profile(hp);
+ free((char*)hp);
+ }
}
state2:
state = 3;
}
if (sflag || minusc == NULL) {
-#if defined MAX_HISTORY && MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
+#if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY
if (iflag) {
const char *hp = lookupvar("HISTFILE");
+ if (!hp) {
+ hp = lookupvar("HOME");
+ if (hp) {
+ hp = concat_path_file(hp, ".ash_history");
+ setvar2("HISTFILE", hp);
+ free((char*)hp);
+ hp = lookupvar("HISTFILE");
+ }
+ }
if (hp)
line_input_state->hist_file = hp;
+# if ENABLE_FEATURE_SH_HISTFILESIZE
+ hp = lookupvar("HISTFILESIZE");
+ line_input_state->max_history = size_from_HISTFILESIZE(hp);
+# endif
}
#endif
state4: /* XXX ??? - why isn't this before the "if" statement */
_mcleanup();
}
#endif
+ TRACE(("End of main reached\n"));
exitshell();
/* NOTREACHED */
}
projects / platform / upstream / busybox.git / blobdiff